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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0814da051a8d260260d5dc27d8cc908097425f941767bd9579e8259619617f2' 
  AND token = 'OhRc6PWbCqfeQqv1JLbSt3JkWXt+IiVxpdX/f9QK8b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}